Note: Updates from Mac OS Ventura will not work to update the altimeter, for which reason it is recommended to use a PC or a previous Mac OS.

Firmware Version 3.8 (4/7/23)
Improvements to flash memory system. Enables flash memory reformatting by holding down top button for five seconds when pressing reset button on altimeter. (It is normal to see your approximate altitude reported MSL after this update for several minutes.).
DigiAlti_Firmware_3_8.zip